City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#385
Imperial
County, CA
92 A
#386 La Palma
County, CA
92 A
#387 Lake Almanor
County, CA
92 A
#388 Lodi
County, CA
92 A
#389 Long Beach
County, CA
92 A
#390 Montara
County, CA
92 A
#391 Oak View
County, CA
92 A
#392 Ojai
County, CA
92 A
#393 Palm Springs
County, CA
92 A
#394 Placentia
County, CA
92 A
#395 Rancho Cucamonga
County, CA
92 A
#396 Rancho Murieta
County, CA
92 A
#397 Riverbank
County, CA
92 A
#398 Rowland Heights
County, CA
92 A
#399 San Andreas
County, CA
92 A
#400 San Bernardino
County, CA
92 A
#401 Santa Barbara
County, CA
92 A
#402 Santa Cruz
County, CA
92 A
#403 Sonora
County, CA
92 A
#404 Springville
County, CA
92 A
#405 Sunnyvale
County, CA
92 A
#406 Anderson
County, CA
91 A
#407 Camp Pendleton
County, CA
91 A
#408 Cloverdale
County, CA
91 A
Frequently Asked Questions
How are city water quality rankings calculated in California?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in California?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.